1. Name any two tributaries of River Ganga in the Lower Ganga Plain. Answer: Son and Gomati are the tributaries of River Ganga int he Lower Ganga Plain. 2. Name the rivers in the Doab region.Answer: Ganga and Yamuna are the rivers in the Doab region. 3. Which is the northernmost river in the Ganga Plain?Answer: Yamuna is the northernmost river in the Ganga Plain. 4. What is the height of Bhabar Zone?Ans. More than 300 Metres.